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The silicon-rectifier generator is driven by a diesel engine, and the rotational speed varies with the speed of the diesel engine over a wide range. The rotational speed of the generator is high, the voltage it sends out is high; The rotational speed is low, the voltage that it sends is low too, in order to keep the generator terminal voltage basically stable, must set up the voltage regulator. The transistor voltage regulator is a widely used silicon-rectifier voltage regulator. The operating principle is described below.
The transistor voltage regulator mainly uses the switching characteristics of the transistor, and the transistor is turned on and off by a voltage regulator tube, that is, the switching current of the charging generator is used to control the excitation current of the charging generator so as to stabilize the output voltage of the charging generator. The following figure shows the circuit schematic of the JFT207A transistor regulator that is used on the 12V135 diesel engine and is compatible with the JF1000N alternator. Its working process is as follows:
When the generator speed increases, its output voltage exceeds the specified value, the voltage regulator circuit VZ breakdown in the voltage regulator circuit, the switch circuit transistor VT1 conduction and the later stage to the composite transistor VT2, VT3 cut-off, The generator field current as a VT3 load is cut off, causing the generator output voltage to drop. The drop in output voltage in turn causes VZ, which is already in the breakdown state, to end. At the same time, VT1 will also be cut off due to the loss of base current, VT2 and VT3 will be re-conducted, the field current of the generator will be switched on, and the generator's output voltage will rise again. This repeats the regulator until it controls and stabilizes the generator output voltage. The other components in the line serve as stability, compensation, and protection, respectively, to improve the performance and reliability of the regulator.
The voltage regulator must be installed vertically with its terminals down to achieve drip protection. When using, pay attention to use with the corresponding type of charging generator. Wiring should be correct and reliable, insulation should be intact, otherwise it may cause the voltage regulator to burn out. Under normal circumstances, do not open the regulator cover casually. If there is a fault, it should be overhauled by qualified personnel.